What are design patterns?

A design pattern is a solution to a common programing problem in software design. Patterns are not complete solutions but conceptual ideas for dealing with common issues. Patterns help communicate a common language among developers.

Keynotes:

• What are design patterns?
  • A proven solution to a common issue in software design.
  • Patterns encourage reusable design strategies.
  • Common vocabulary and structure.
• What design patterns are not?
  • An exact solution to a problem.
  • They don't replace good design strategy.
  • Can lead to inefficient solutions
• What makes a pattern.
  • purpose
  • usefulness
  • applicability
  • acceptance (early stages proto-pattern)
• Common Types of Patterns
  • Creational Patterns
  • Structural Patterns
  • Behavioral Patterns